Why you need a big air filter - 101 - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 23 Old 07-24-2010, 11:20 AM Thread Starter
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Why you need a big air filter - 101

Keep seeing people put horribly small air filters on their turbos
time and time again has made me want to finally explain why this is bad.


1.

When the turbo has to work to pull air in it is actually creating a vacuum
at the inlet in regards to normal ambient air pressure.

What this means is the turbo is starting at a negative boost pressure
instead of at 0. So to make 10psi of boost pressure the turbo is actually
having to produce 12psi thru the compressor to compensate for the 2psi vac
it had to start out with.

This raises your actual P.R. (pressure ratio) the compressor is working at
which means the turbo is dumping more heat into the intake charge than
it needs to, which kills intercooler efficiency, intake charge density and horsepower.



2.

It also puts a load on the center shaft of the turbo that it was not designed
for and causes premature bearing wear.




Just by putting a proper sized air filter on you can ..........

Increase hp
reduce intake temps
reduce chances of detonation
increase turbo life span.


It matters.


Democracy is two wolves and a sheep sitting down and voting on whats for lunch.

Last edited by r.barn; 07-24-2010 at 12:04 PM.
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post #2 of 23 Old 07-24-2010, 01:32 PM
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Interesting stuff I've never heard. But one problem some people will have is how much actual room they'll have to put a filter on. And they may ask what a "proper" size filter is for their app. My old combo had a monster K&N or I just ran it open, but I had plenty of room.


Scotty we need more power!!!
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post #3 of 23 Old 07-24-2010, 02:08 PM
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exactly....plus most companies that sell kits come w/a air filter. People might think well since it came with this filter it must be the right one,but is it? I think ur gonna have to explain/list what would be the proper size for diff app's. Like stated theres a prob w/havin the room for a big filter too. So are the filters that come w/the kits right or wrong? What filters do u suggust?

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post #4 of 23 Old 07-24-2010, 03:17 PM Thread Starter
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The biggest one you can make fit somewhere - somehow.
You're shooting for zero restriction. Try and imagine what size filter
you would want on a 600hp N/A motor.

Get inventive with elbows and kick it into the wheel well.

My TT has twin 8" K&N filters in each wheel well.

single 8" K&N cone filter is smallest I would try and fit and if you
could figure out how to get a 10" or 12" filter it wouldnt hurt.

Anderson Motorsports sells some monster cone filters.

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post #5 of 23 Old 07-24-2010, 04:23 PM
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Basically its all about CFM requirements...guys have reported picking up 40rwhp on the dyno by taking a normal sized cone filter off. Problem was the turbo was consuming more CFM than the filter was rated for. The good filter companies give you the CFM ratings of their filters. Which you can then compare against your compressor map.

But R.Barn is right...don't overlook this. There is a reason why the big boys run screens...

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post #6 of 23 Old 07-24-2010, 04:24 PM
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Quote:
Originally Posted by r.barn View Post
The biggest one you can make fit somewhere - somehow.
You're shooting for zero restriction. Try and imagine what size filter
you would want on a 600hp N/A motor.

Get inventive with elbows and kick it into the wheel well.

My TT has twin 8" K&N filters in each wheel well.

single 8" K&N cone filter is smallest I would try and fit and if you
could figure out how to get a 10" or 12" filter it wouldnt hurt.

Anderson Motorsports sells some monster cone filters.


so would space infront of the turbo be a problem? i have maybe 2 inches from the inlet of my turbo to the inner fender. i have a screen in place to protect from larger objects.

89 gt turbo- R.I.P - f#@K TURBO GOING OLD SCHOOL CARB AND NITROUS...... BUILD IN THE WORKS.
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post #7 of 23 Old 07-24-2010, 05:49 PM Thread Starter
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screens are for dragsters. most of the time they dont even run that.

street car needs a filter.

Get inventive. Think out of the box on putting an elbow on the
turbo to turn the filter.

If they only left you 2 inches to squeeze a filter on the turbo, then
its not a very good kit then. Or at least wasnt as well planned as it could
have been .............

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post #8 of 23 Old 07-24-2010, 06:23 PM
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Quote:
Originally Posted by r.barn View Post

If they only left you 2 inches to squeeze a filter on the turbo, then
its not a very good kit then. Or at least wasnt as well planned as it could
have been .............
a 4" 90 is all thats needed. no need to slam peoples work.

when will your turbo kits be available? id love to see one up close.
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post #9 of 23 Old 07-24-2010, 06:29 PM
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please find me an air filter

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post #10 of 23 Old 07-24-2010, 10:07 PM Thread Starter
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please find me an air filter




and also like I said ........... dragsters dont run filters.


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post #11 of 23 Old 07-24-2010, 11:44 PM
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Quote:
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please find me an air filter

how about a birdcage with a towel wraped around it..LOL!!! setup looks great..
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post #12 of 23 Old 07-25-2010, 10:24 AM
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Quote:
Originally Posted by r.barn View Post
screens are for dragsters. most of the time they dont even run that.

street car needs a filter.

Get inventive. Think out of the box on putting an elbow on the
turbo to turn the filter.

If they only left you 2 inches to squeeze a filter on the turbo, then
its not a very good kit then. Or at least wasnt as well planned as it could
have been .............
its a cartech kit i have and i chose not to cut a hole in the inner fender because i dont know how long i will keep this kit. id rather not have a 4 inch hole after i upgrade. but to re-ask the question. will this make the turbo less efficient?

89 gt turbo- R.I.P - f#@K TURBO GOING OLD SCHOOL CARB AND NITROUS...... BUILD IN THE WORKS.
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post #13 of 23 Old 07-25-2010, 10:38 AM Thread Starter
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Originally Posted by kellam View Post
its a cartech kit i have and i chose not to cut a hole in the inner fender because i dont know how long i will keep this kit. id rather not have a 4 inch hole after i upgrade. but to re-ask the question. will this make the turbo less efficient?
I have seen a lot of conflicting info on using a screen.

If it's a screen with 1" holes to keep small birds out it is probably
not hurting anything.

BUT, I have seen some very knowledgeable people say that using
window screening with it's itty bitty holes is really bad. They are
huge restriction and dont flow air very well at all.

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post #14 of 23 Old 07-25-2010, 11:08 AM
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thanks for the info. i guess i will be finding a new solution.

89 gt turbo- R.I.P - f#@K TURBO GOING OLD SCHOOL CARB AND NITROUS...... BUILD IN THE WORKS.
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post #15 of 23 Old 07-25-2010, 05:40 PM
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I was thinking about this problem, and notice that almost all the import guys run those mushroom filters.


I just don't know how well these flow in comparison to a k&n style filter. Anyone have any input?

*I was going to post an image, but it says I still can't attach links... WTF does it take around here to post up a picture?

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post #16 of 23 Old 07-25-2010, 06:02 PM
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Quote:
Originally Posted by lancec2c30 View Post
I was thinking about this problem, and notice that almost all the import guys run those mushroom filters.


I just don't know how well these flow in comparison to a k&n style filter. Anyone have any input?

*I was going to post an image, but it says I still can't attach links... WTF does it take around here to post up a picture?
Those mushroom filters are junk and should stay on the rice burners.

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Old combo:352 single 76mm turbo, 16psi, AOD, 9.41 @ 149mph, E85, 255/50/16 MT DR, 3500lb STREET car driven everywhere.
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post #17 of 23 Old 07-25-2010, 06:03 PM Thread Starter
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We know what you mean.

Those shroom filters suck.



Few more post and you will get picture posting access.

Democracy is two wolves and a sheep sitting down and voting on whats for lunch.

Last edited by r.barn; 07-25-2010 at 09:58 PM.
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post #18 of 23 Old 07-25-2010, 06:12 PM
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Alright, guess that solves that one. Lol.

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post #19 of 23 Old 07-25-2010, 06:59 PM
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My fox picked up 2mph just by removing the small little BG filter.

Been out of the game since 2011.. looking to get back in in 2019
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post #20 of 23 Old 07-25-2010, 11:53 PM
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Quote:
Originally Posted by Rich Gill View Post
My fox picked up 2mph just by removing the small little BG filter.
Did you go with a screen or just open?

Scotty we need more power!!!
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post #21 of 23 Old 07-26-2010, 04:44 AM
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Running a screen or not makes no difference on my car as far as track times go.

80 coupe, N/A 347, tko500 1.34, 6.30 @ 109.01, 9.87 @ 137.06

16 GT, daily driver on pump 93, Procharger 1.42, 6.31 @ 109.59, 9.80 @ 141.57
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post #22 of 23 Old 07-26-2010, 05:52 AM
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Did you go with a screen or just open?
open

Been out of the game since 2011.. looking to get back in in 2019
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post #23 of 23 Old 07-26-2010, 12:34 PM
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With the On3 5.0 kits we pick up 25-35hp "depending on boost level" by removing the filter

94 GT 327 S-trim 4r70w yadda yadda

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